climate change and crop water productivity - impact and mitigation
TRANSCRIPT
CLIMATE CHANGE AND CROP WATER CLIMATE CHANGE AND CROP WATER PRODUCTIVITY - IMPACT AND PRODUCTIVITY - IMPACT AND
MITIGATIONMITIGATION
CREDIT SEMINAR AGROMET 591CREDIT SEMINAR AGROMET 591
PRESENTED BYPRESENTED BY DEBJYOTI MAJUMDERDEBJYOTI MAJUMDER L-2013-A-15-ML-2013-A-15-M SCHOOL OF CLIMATE CHANGE AND AGRICULTURAL SCHOOL OF CLIMATE CHANGE AND AGRICULTURAL METEOROLOGYMETEOROLOGY
WHAT IS CLIMATE CHANGEWHAT IS CLIMATE CHANGE
Climate is the average weather at a given point and Climate is the average weather at a given point and time of year, over a long period (typically 30 years).time of year, over a long period (typically 30 years).
We expect the weather to change a lot from day to We expect the weather to change a lot from day to day, but we expect the climate to remain relatively day, but we expect the climate to remain relatively constant.constant.
If the climate doesn’t remain constant, we call it If the climate doesn’t remain constant, we call it climate change.climate change.
The key question is what is a significant change – The key question is what is a significant change – and this depends upon the underlying level of and this depends upon the underlying level of climate variabilityclimate variability
Crucial to understand difference between climate Crucial to understand difference between climate change and climate variabilitychange and climate variability
Earth’s climate system – Greenhouse EffectEarth’s climate system – Greenhouse Effect
Could the warming be natural?Could the warming be natural?
Relative increase in Green House Gases Relative increase in Green House Gases influenced by anthropogenic activitiesinfluenced by anthropogenic activities
Gases CO2 CH4 N2O CFC’s
Pre-industrial atmospheric
concentration
280 ppmv 0.70 ppmv 280 ppbv 0
Current concentration
400 ppmv 1.89 ppmv 3.26 ppbv 5.03 pptv
Annual increase (%)
0.5 %(1.5 - 1.8 ppmv)
0.8 % (0.013 ppmv)
0.25 %(0.75 ppbv)
4 %(18 -20 pptv)
Global warming potential
relative to CO2
1 24.5 320 4000
Trends significant at the 5% level indicated with a ‘+’. Grey: insufficient data
Observed surface temperature trendObserved surface temperature trend
Maximum Temperature Minimum Temperature
Annual maximum and minimum temperature at Annual maximum and minimum temperature at Ludhiana Ludhiana
Jalota and Kaur (2013)Jalota and Kaur (2013)
Sea-level from satellites: 4 cm rise in 10 yearsSea-level from satellites: 4 cm rise in 10 years
Recent vagaRies /incidencesRecent vagaRies /incidences
DROUGHT HITS DROUGHT HITS KARNATAKAKARNATAKA
20082008
COLD WAVE IN COLD WAVE IN NORTHNORTH
20062006
HEAT WAVE IN HEAT WAVE IN NORTHERN INDIANORTHERN INDIA
20072007
NILAM CYCLONE 2012 Uttarakhand flood 2013 Hud Hud 2014
C3 plants
C4 plants
StephenStephen et al et al (2006) (2006)
Current CO2 levels
2 x CO2
Impact Of COImpact Of CO22 on Agricultural Productivity on Agricultural Productivity
TreatmentTreatment Grain yield (g/ Grain yield (g/ mm22))
Filled grains Filled grains (%)(%)
Individual grain Individual grain weight (mg)weight (mg)
Elevated COElevated CO22
(570 ppm)(570 ppm)
971 (24)*971 (24)* 82.9 (9)82.9 (9) 24.9 (2)24.9 (2)
Ambient COAmbient CO22
(370 ppm)(370 ppm)
783783 76.0 76.0 24.5 24.5
OpenOpen 723723 72.072.0 24.024.0
CD (p= 0.05) CD (p= 0.05) 9595 4.24.2 1.31.3
* percentage increase over ambient* percentage increase over ambient Costa et al (2006)
Effect of COEffect of CO22 concentrations on rice concentrations on rice
Effect of temperature change on growth and Effect of temperature change on growth and yield of Riceyield of Rice
Hundal and Kaur (2007)Hundal and Kaur (2007)
TemperatureTemperatureCOCO2 2 (ppm)(ppm)
Normal ( 330 ) Normal ( 330 ) 400400 500500 600600
Deviation from normal ( % )Deviation from normal ( % )
NormalNormal 7563*7563* +1.5+1.5 +6.6+6.6 +8.7+8.7
+ 0.5+ 0.500CC -3.7-3.7 -1.1-1.1 +2.2+2.2 +5.1+5.1
+ 1.0+ 1.000CC -6.6-6.6 -4.3-4.3 -2.8-2.8 +0.5+0.5
+ 1.5+ 1.500CC -8.8-8.8 -8.4-8.4 -6.1-6.1 -3.5-3.5
+ 2.0+ 2.000CC -7.5-7.5 -7.2-7.2 -4.4-4.4 -2.8-2.8
Effect of CO2 and temperature on Grain yield (kg/ha) of Rice
* grain yield at normal CO* grain yield at normal CO2 2 and temperatureand temperature
Hundal and KaurHundal and Kaur (2007)(2007)
Year Rise in temp (°C)
Productivity (Kg/ha)
Deviation in productivity
from 2005 (%)
Grain yield Grain yield
2005 0 2406 -
2020 0.6 2489 3.45
2050 1.6 2407 0.04
2080 2.6 2214 -7.98
2100 3.2 1972 -18.04
Effect of doubling COEffect of doubling CO2 2 concentration (682 ppm) and concentration (682 ppm) and
rise in mean temperature on productivity of Maize rise in mean temperature on productivity of Maize
Sharma et al (2013)
Atmospheric CO2 conc.
(ppm)
Rise in Temperature (OC)
Nil (current)
1 2 3 4 5
369 (current)0.0 -6.27 -17.09 -28.10 -42.55 -60.55
400 (2020)3.40 -3.16 -14.57 -25.54 -58.63 -58.63
550 (2050)18.65 11.12 -1.25 -13.72 -30.25 -49.94
Singh and Lal (2009)Singh and Lal (2009)
Impact of climate change on tuber yield Impact of climate change on tuber yield productivity productivity
Of all the water on Earth, only a small amount is Of all the water on Earth, only a small amount is available for us to use. It's true!available for us to use. It's true!
96.5% of the Earth's water supply is salt water.96.5% of the Earth's water supply is salt water.
Only 2.8% is fresh water!Only 2.8% is fresh water!
That 2.8% is divided like this:That 2.8% is divided like this:
0.76% is groundwater (we can use some of this water) 0.76% is groundwater (we can use some of this water)
0.0132% is in lakes and streams (we can use some of 0.0132% is in lakes and streams (we can use some of this water) this water)
1.74% is in glaciers and icecaps 1.74% is in glaciers and icecaps
0.001% is water vapor 0.001% is water vapor
Amount of fresh wAter in the Amount of fresh wAter in the world …world …
Rainfall Partitioning - Field ScaleRainfall Partitioning - Field Scale
Figures adapted from Hatibu & Rockström (2005)Figures adapted from Hatibu & Rockström (2005)
Rainfall Rainfall ((100%100%))
OCEANOCEAN
Crops (Crops (10-10-30%30%))
EvaporationEvaporation((30-50%30-50%))Weeds (Weeds (10-20%10-20%))
StorageStorage
Deep PercolationDeep Percolation
((5-10%5-10%))
Runoff (Runoff (10-30%
10-30%))
Concepts of Crop Water Use Efficiency (WUE)Concepts of Crop Water Use Efficiency (WUE)
Crop Economic WUE Crop Economic WUE = = Gross return / Evapotranspiration (mm) )
Crop WUECrop WUE= = Yield kg / Evapotranspiration (mm)
Irrigation Water Use Efficiency (WUE)Irrigation Water Use Efficiency (WUE)
Irrigation WUE Irrigation WUE = = Yield kg/ Irrigation water applied (ML)
Gross Production Economic WUE Gross Production Economic WUE = = Gross return $ / Total
water applied (ML)
Irrigation Economic WUEIrrigation Economic WUE= = Gross return $ / Irrigation water
delivered to the field (ML)
Goyal, 2004Goyal, 2004
Effect of Meterological Parameters on potential Effect of Meterological Parameters on potential evapotranspirationevapotranspiration
Factors affecting Reference Factors affecting Reference EvapotranspirationEvapotranspiration
Singh, 2010Singh, 2010
Variablity in Reference Crop Variablity in Reference Crop Evapotranpiration ETEvapotranpiration ET00
Wang Wang et al, 2012et al, 2012
Relation between PET of wheat and Weather parametersRelation between PET of wheat and Weather parameters Relation between PET of wheat and Weather parametersRelation between PET of wheat and Weather parametersParameter Regression EquationRegression Equation R2
Rainfall amount (RF) Y = -0.493 x + 543.9 0.58
No. of rainy days (NoRD) Y = -6.619 x + 564.1 0.55
Maximum temperature (Tmax)
Y = 45.34 x - 531.6 0.79
RF, NoRD, Tmax Y = -228.02 + 33.21 X1 – 0.078 X2 – 2.01 X3
Where,X1 = Mean monthly maximum temperature (November - March)X2 = Total Rainfall (November - March)X3 = Total number of rainy days (November - March)
0.83
Kingra and Kukal, 2013 Kingra and Kukal, 2013
Kingra and Kukal, 2013 Kingra and Kukal, 2013
Variabilty in Water Use Efficiency of wheat in central Punjab
Land Configuration
Anti-transpirants
Date of Sowing
Tillage
Mulching
Method of Irrigation
Planting Pattern
Irrigation Scheduling
MULCHESMULCHES Surface mulching either by timely intercultivation or by
covering the soil surface with plant residues benefits
the crops in the following ways :
• Reduce water evaporation from soil.
• Reduces water runoffs from the cropped
fields.
• Help control weeds.
• Adds organic matter to the soil and
improves soil quality.
Mulch and tillage effects on oxygen Mulch and tillage effects on oxygen diffusion rate (ODR) (×10 diffusion rate (ODR) (×10 −8−8 g cm g cm −2−2 s s −1 −1 ))
Kahlon et al, 2013Kahlon et al, 2013NT- No tillage, RT- Ridge tillage PT- Plough tillageNT- No tillage, RT- Ridge tillage PT- Plough tillage
Silty loamSilty loam
EEss TT ETET
Mulch8 Mg ha-1
100 240 340
No Mulch 135 210 345
LSD (0.05) 10 26 NS
Mulch No mulch
LSD (0.05)
Grain transpiration
efficiencyKg mm -1 ha -1
14.6 16.4 1.2
Total biomass
transpiration efficiency
Kg mm -1 ha -1
36.6 41.4 3.1
Effects of Mulching on the Effects of Mulching on the partitioning of ET in wheatpartitioning of ET in wheat
Effects of Mulching on Effects of Mulching on transpiration efficiency in wheattranspiration efficiency in wheat
Singh Singh et alet al , 2011 , 2011
Clay loam
Water Use efficiency of wheat under different tillage and mulch
CTCT BPBP
FactorsFactors MM00 MM11 MM00 MM11
Moisture Moisture depletion (cm)depletion (cm) 19.0219.02 15.1215.12 18.6318.63 15.1115.11
Water Use (cm)Water Use (cm) 26.0526.05 22.1522.15 24.3724.37 22.1822.18
Yield (kg haYield (kg ha-1-1)) 32963296 36133613 32063206 37823782
WUE WUE (kg ha(kg ha-1-1cmcm-1-1)) 126.5126.5 163.2163.2 131.6131.6 170.5170.5
Meena Meena et alet al, 2011, 2011CT – Conventional tillage, BP – Bed PlantingCT – Conventional tillage, BP – Bed Planting
Response of straw mulch on crop yield and irrigation water saving
Crop Yield increase(kg ha-1)
Irrigation water saving (cm)
Maize fodder 7500 15
Sorghum fodder 7200 23
Mentha 700 32
Sugarcane 4300 40
Potato 3900 12
Moong 100 7
Jalota Jalota et al, et al, 20072007
Clay soilClay soil Meena Meena et alet al , 2011, 2011
EffEct of Straw mulch on thE root lEngth EffEct of Straw mulch on thE root lEngth dEnSity of whEatdEnSity of whEat
PROMOTION OF PRECISION LAND LEVELLINGPROMOTION OF PRECISION LAND LEVELLING
131225900
116150
280172
608165
0
50000
100000
150000
200000
250000300000
350000
400000
450000
500000
550000
600000
2005 2006 2007 2008 2009
Years
Are
a C
overe
d (
ha)
Area Covered during 2009: 3.28 lac hectares
Effects of land configuration on IW (cm) and WUE ( kg ha -1 cm-1)
Sidhu Sidhu et alet al, 2005, 2005Loamy sand, pH- 8.3Loamy sand, pH- 8.3
R - Ridge, BB- Broad bed, NB - Narrow bedR - Ridge, BB- Broad bed, NB - Narrow bed
Influence of irrigation, tillage, and mulching on Influence of irrigation, tillage, and mulching on WP (kg haWP (kg ha-1-1 mm mm-1-1) of soybean in the two soils ) of soybean in the two soils
Arora Arora et alet al, , 20112011
Loamy sandLoamy sand Sandy loamSandy loam
TillageTillage MulchMulch 6 t ha6 t ha-1-1
IIpp IIff IIpp IIff
CTCT
M0M0 1.391.39 1.871.87 3.163.16 2.782.78
MM 1.671.67 2.262.26 3.893.89 3.303.30
DTDTM0M0 1.661.66 2.252.25 3.553.55 2.822.82
MM 1.971.97 2.332.33 3.783.78 3.283.28
CT –Conventional tillage, DT -Deep CT –Conventional tillage, DT -Deep tillagetillageII pp - Partial irrigation, I- Partial irrigation, I ff -Full irrigation -Full irrigation
Method Of crop Establishment
Grain Yield (kg/ha)
Total ET (mm)
WUE (kg/m-3 )
Net Productivity
of used water (Rs m-3
)
Early sowing with minimum tillage
Late sowing with minimum Tillage
1290
1060
241.3
182.8
0.60
0.58
4.85
4.30
Paira cropping without Tillage 750 188.6 0.40 2.93
CD(P=0.05) 130 21.4 0.06 0.37
Grain Yield, Evapotranspiration,WUE and Net Water Productivity in Horsegram Under different Tillage Practices
Singh Singh et alet al, 2008, 2008
Indicative World’s Irrigation Water EfficiencyIndicative World’s Irrigation Water Efficiency
15%
25%
15%
45%
Distribution LossesApplication LossesConveyance LossesCrop Use
Serageldin (1997)Serageldin (1997)
Irrigation Efficiencies under Different Irrigation Efficiencies under Different MethodsMethods
Irrigation EfficienciesIrrigation Efficiencies Method of Irrigation (%)Method of Irrigation (%)
Surface Surface Sprinkler Sprinkler DripDrip
Conveyance EfficiencyConveyance Efficiency 40-50 (canal)40-50 (canal)60-70 (well) 60-70 (well) -- --
Application EfficiencyApplication Efficiency 60-70 60-70 70-80 70-80 9090
Surface water moisture Surface water moisture evaporation evaporation
30-40 30-40 30-4030-40 20-2520-25
Overall efficiencyOverall efficiency 30-3530-35 50-6050-60 80-9080-90
Impact of Irrigation method On Water use Efficiency Impact of Irrigation method On Water use Efficiency in Cottonin Cotton
Ibragimov Ibragimov et al et al (2007)(2007)
CHANGE IN CROP CALENDERCHANGE IN CROP CALENDERD
EP
LE
TIO
N I
N W
AT
ER
LE
VE
L
DE
PL
ET
ION
IN
WA
TE
R L
EV
EL
(C
M)
(CM
)
Recommended Date of Paddy Transplantation
If paddy is transplanted after 15th June, then net recharge and net draft If paddy is transplanted after 15th June, then net recharge and net draft balance each other in case rainfall is normal balance each other in case rainfall is normal
Grain yield and water productivity of wheat as Grain yield and water productivity of wheat as influence by planting patterninfluence by planting pattern
Planting Planting patternpattern
Seed rate Seed rate (kg ha(kg ha-1-1))
No. of No. of spikes/mspikes/m33
Grain Grain yieldyield
(t ha(t ha-1-1))
Water Water productivitproductivity (kg grainy (kg grain
mm-3 -3 ))
Bed 90 cmBed 90 cm 8080 445445 6.186.18 2.252.25
Flat bedFlat bed 100100 426426 5.285.28 1.261.26
CD (0.05)CD (0.05) 19.8419.84 0.3430.343 0.110.11
Silty loamSilty loamSilty loamSilty loam Kumar Kumar et alet al, 2010, 2010Kumar Kumar et alet al, 2010, 2010
Planting Patterns
Cane Yield (t/ha)
Water Applied
(cm)
WUE(kgm3
)
Paired row Planting Paired row Planting (0.75m)(0.75m)
158.8158.8 91.491.4 17.3717.37
Four row Planting Four row Planting (0.90m)(0.90m)
161.4161.4 106.4106.4 15.1615.16
Normal Planting Normal Planting (1.0m)(1.0m)
136.8136.8193.0193.0 7.087.08
Effect of Planting Pattern on yield and WUE Effect of Planting Pattern on yield and WUE Of Sugarcane in Rahuri, MaharashtraOf Sugarcane in Rahuri, Maharashtra
Yadav Yadav et alet al, 2000, 2000
Anti-transpirantsAnti-transpirants
AntitranspirantsAntitranspirants is any material applied to transpiring plant surface for reducing water losses from plant.
Nearly 99% of water absorbed by the plant is lost in transpiration Stomatal closing type – Phenyl mercuric acetate and Atrazine Film forming type – Plastic and waxy materials (Mobileaf,
Hexadeconol, Silicon) form a thin film on the leaf surface Reflectant type – White material form a coating on the leaves
and increase the leaf reflectance (5% Kaolin spray) Growth retardant – Chemicals reduce shoot growth and increase
root growth and thus enable the plant to resist drought (Cycocel). They may also induce stomatal closure.
TreatmentsTreatments Mean transpirationMean transpiration Dry Matter Dry Matter productionproduction
WUEWUE
Soil Moisture Soil Moisture RegimesRegimes
gm/potgm/pot gm/potgm/pot gm /gm gm /gm ×104×104
LowLow 20842084 8.58.5 40.840.8
HighHigh 27602760 9.49.4 34.034.0
Anti-transpirantAnti-transpirant
ControlControl 32343234 8.78.7 8.78.7
PMAPMA 21922192 8.18.1 8.18.1
KaoliniteKaolinite 25982598 8.88.8 8.88.8
PMA + KaolinitePMA + Kaolinite 18181818 9.29.2 9.29.2
MobileafMobileaf 22722272 10.010.0 10.010.0
Patil and De, 2006Patil and De, 2006
Influence of Anti-transpirants On Water Productivity Influence of Anti-transpirants On Water Productivity of Rapeseed (of Rapeseed (Brassica campestrisBrassica campestris L.) L.)
CONCLUSIONSCONCLUSIONS
• With the increase in temperature, the PET demand will be increased With the increase in temperature, the PET demand will be increased
so as the crop water requirement.so as the crop water requirement.
• Increase in evapo-transpiration due to global warming can put Increase in evapo-transpiration due to global warming can put tremendous pressure on existing over-stressed water resources. tremendous pressure on existing over-stressed water resources.
• More emphasis is needed to develop technologies for reducing water More emphasis is needed to develop technologies for reducing water losses, conservation of rain water and development of crop varieties losses, conservation of rain water and development of crop varieties requiring less water.requiring less water.
• Different management strategies such as proper irrigation methods Different management strategies such as proper irrigation methods and scheduling, use anti-transpirants and proper management of and scheduling, use anti-transpirants and proper management of cultural practices enhance the yield and decreases ET losses.cultural practices enhance the yield and decreases ET losses.
• Integrated research efforts involving agrometeorologists,, Integrated research efforts involving agrometeorologists,, agronomists, soil water engineers and plant breeders are required to agronomists, soil water engineers and plant breeders are required to manage the water resources and crop water productivity under manage the water resources and crop water productivity under changing climatic conditionschanging climatic conditions. .
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